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Aleck Lin wrote:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">David, <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I saw your post from last
year (<a moz-do-not-send="true"
href="http://ozlabs.org/pipermail/linuxppc-embedded/2005-November/021090.html">http://ozlabs.org/pipermail/linuxppc-embedded/2005-November/021090.html</a>)<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">And I have a couple of
questions. <o:p></o:p></span></font></p>
<ol style="margin-top: 0in;" start="1" type="1">
<li class="MsoNormal" style=""><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Were you able to use the
Xilinx_enet from 2.4 tree for kernel 2.6?? <o:p></o:p></span></font></li>
<li class="MsoNormal" style=""><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I’m assuming that you’ve
probably have made it work by now. Can I get some hints on making the
ethernet driver for 2.6?<o:p></o:p></span></font></li>
</ol>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Thanks!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Aleck<o:p></o:p></span></font></p>
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Aleck;<br>
<br>
I have been doing board bringup for the Pico E1x series of boards.
They are Xilinx V4 boards.<br>
I started with the Linux 2.6 kernel.org tree before there was any
Xilinx V4 support - I have subsequently conformed<br>
my code to Grant's patches.<br>
I looked at the MV xilinx_edk stuff for UartLite and Ethernet and
decided their code just looked too gnarly.<br>
I wrote a UartLite driver of my own from scratch. It was fairly
simple and I have Uartlite support from the early boot code on.<br>
<br>
I started the TEMAC much later. Pico had me work with the LocalLink
TEMAC at first. That was an almost from scratch driver.<br>
It was just barely working when they switched gears and decided to
use the PLB FIFO TEMAC.<br>
I pulled the MV 2.6 TEMAC driver from the patches posted on this
list - NOT from the 2.4 tree - though there is an obvious common
heritage.<br>
That driver works fine - given the caveat I listed - it does NOT
have PHY/MII autonegotiation support. It is not difficult to hardcode
for whatever <br>
fixed speed you want, but the caveat is still there. Purportedly,
proper support is complete or nearly complete - but I have not seen it
posted.<br>
<br>
In the interim I started a from scratch PLB FIFO TEMAC driver. It
does NOT support SG DMA - I think Xilinx is now insisting you build the
<br>
PLB TEMAC one way or the other, but you can't build it both. As
such I do not beleive the driver should be designed to be able to
dynamic mode switching <br>
on a condition that can not change dynamically - byt the
MV/Xilinx_EDK driver does.<br>
<br>
I also had another motive for doing a from scratch driver - I had a
contract to write basically the same driver for GHS Integrity.<br>
I basically took the Linux driver gutted the Linux specific
interfaces, added the GHS interfaces and created a Linux like sk_buff
shim for GHS and had the thing working in fairly <br>
short order. In fact the GHS driver works better than the Linux
driver at the moment. It was also a higher priority.<br>
I am only just getting back to cleaning up and fixing the Linux
driver - so it still has a few minor problems and I need to pick up
some improvements that occured as it <br>
moved forward to GHS.<br>
<br>
My from scratch driver very loosely used the EDK code as a starting
point. It drew atleast as much from my LL TEMAC. Right now it sends
fine. Autonegotiates <br>
10/100/1000 FD. It appears to receive fine, but Linux silently
dropps the received packets without reporting an error.<br>
Whatever the problem is - it is with my driver. It is almost
certainly trivial. It is also almost certainly going to be a bear to
find.<br>
I had hoped someone with a similar problem (on any driver) might
have given me a clue how they fixed it. But so far no joy.<br>
I only recently got back to work on the Linux driver. I do expect
it will be complete soon. <br>
<br>
In the meantime the posted MV Xilinx_edk based driver works -
within its limits.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Dave Lynch DLA Systems
Software Development: Embedded Linux
717.627.3770 <a class="moz-txt-link-abbreviated" href="mailto:dhlii@dlasys.net">dhlii@dlasys.net</a> <a class="moz-txt-link-freetext" href="http://www.dlasys.net">http://www.dlasys.net</a>
fax: 1.253.369.9244 Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.
"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein
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